<template>
	<view v-if="value" class="tn-picker-class tn-picker">
		<tn-popup v-model="value" mode="bottom" :popup="false" length="auto" :safeAreaInsetBottom="safeAreaInsetBottom"
			:maskCloseable="maskCloseable" :zIndex="elZIndex" @close="close">
			<view class="tn-picker__content" :style="{ zIndex: elZIndex }">
				<!-- 顶部 -->
				<view class="tn-picker__content__header" @touchmove.stop.prevent>
					<!-- 取消按钮 -->
					<view class="tn-picker__content__header__btn tn-picker__content__header--cancel"
						:style="{ color: cancelColor }" hover-class="tn-hover-class" :hover-stay-time="150"
						@tap="getResult('cancel')">{{cancelText}}</view>
					<!-- 标题 -->
					<view class="tn-picker__content__header__title">{{ title }}</view>
					<!-- 确认按钮 -->
					<view class="tn-picker__content__header__btn tn-picker__content__header--confirm"
						:style="{ color: moving ? cancelColor : confirmColor}" hover-class="tn-hover-class"
						:hover-stay-time="150" @touchmove.stop @tap.stop="getResult('confirm')">{{confirmText}}</view>
				</view>
				<!-- 主体 -->
				<view class="tn-picker__content__body">
					<!-- 地区选择 -->
					<picker-view v-if="mode === 'region'" class="tn-picker__content__body__view" :value="valueArr"
						@change="change" @pickstart="pickStart" @pickend="pickEnd">
						<picker-view-column v-if="!reset && params.province">
							<view class="tn-picker__content__body__item" v-for="(item, index) in provinces"
								:key="index">
								<view class="tn-text-ellipsis">{{ item.label }}</view>
							</view>
						</picker-view-column>
						<picker-view-column v-if="!reset && params.city">
							<view class="tn-picker__content__body__item" v-for="(item, index) in citys" :key="index">
								<view class="tn-text-ellipsis">{{ item.label }}</view>
							</view>
						</picker-view-column>
						<picker-view-column v-if="!reset && params.area">
							<view class="tn-picker__content__body__item" v-for="(item, index) in areas" :key="index">
								<view class="tn-text-ellipsis">{{ item.label }}</view>
							</view>
						</picker-view-column>
					</picker-view>
					<!-- 时间选择 -->
					<picker-view v-else-if="mode === 'time'" class="tn-picker__content__body__view" :value="valueArr"
						@change="change" @pickstart="pickStart" @pickend="pickEnd">
						<picker-view-column v-if="!reset && params.year">
							<view class="tn-picker__content__body__item" v-for="(item, index) in years" :key="index">
								{{ item }}
								<text v-if="showTimeTag" class="tn-picker__content__body__item__text">年</text>
							</view>
						</picker-view-column>
						<picker-view-column v-if="!reset && params.month">
							<view class="tn-picker__content__body__item" v-for="(item, index) in months" :key="index">
								{{ formatNumber(item) }}
								<text v-if="showTimeTag" class="tn-picker__content__body__item--text">月</text>
							</view>
						</picker-view-column>
						<picker-view-column v-if="!reset && params.day">
							<view class="tn-picker__content__body__item" v-for="(item, index) in days" :key="index">
								{{ formatNumber(item) }}
								<text v-if="showTimeTag" class="tn-picker__content__body__item--text">日</text>
							</view>
						</picker-view-column>
						<picker-view-column v-if="!reset && params.hour">
							<view class="tn-picker__content__body__item" v-for="(item, index) in hours" :key="index">
								{{ formatNumber(item) }}
								<text v-if="showTimeTag" class="tn-picker__content__body__item--text">时</text>
							</view>
						</picker-view-column>
						<picker-view-column v-if="!reset && params.minute">
							<view class="tn-picker__content__body__item" v-for="(item, index) in minutes" :key="index">
								{{ formatNumber(item) }}
								<text v-if="showTimeTag" class="tn-picker__content__body__item--text">分</text>
							</view>
						</picker-view-column>
						<picker-view-column v-if="!reset && params.second">
							<view class="tn-picker__content__body__item" v-for="(item, index) in seconds" :key="index">
								{{ formatNumber(item) }}
								<text v-if="showTimeTag" class="tn-picker__content__body__item--text">秒</text>
							</view>
						</picker-view-column>
					</picker-view>
					<!-- 单列选择 -->
					<picker-view v-else-if="mode === 'selector'" class="tn-picker__content__body__view"
						:value="valueArr" @change="change" @pickstart="pickStart" @pickend="pickEnd">
						<picker-view-column v-if="!reset">
							<view class="tn-picker__content__body__item" v-for="(item, index) in range" :key="index">
								<view class="tn-text-ellipsis">{{ getItemValue(item, 'selector') }}</view>
							</view>
						</picker-view-column>
					</picker-view>
					<!-- 多列选择 -->
					<picker-view v-else-if="mode === 'multiSelector'" class="tn-picker__content__body__view"
						:value="valueArr" @change="change" @pickstart="pickStart" @pickend="pickEnd">
						<picker-view-column v-if="!reset" v-for="(item, index) in range" :key="index">
							<view class="tn-picker__content__body__item" v-for="(sub_item, sub_index) in item"
								:key="sub_index">
								<view class="tn-text-ellipsis">{{ getItemValue(sub_item, 'multiSelector') }}</view>
							</view>
						</picker-view-column>
					</picker-view>
				</view>
			</view>
		</tn-popup>
	</view>
</template>

<script>
	import provinces from '../../libs/utils/province.js'
	import citys from '../../libs/utils/city.js'
	import areas from '../../libs/utils/area.js'

	export default {
		name: 'tn-picker',
		props: {
			value: {
				type: Boolean,
				default: false,
			},
			// 顶部标题
			title: {
				type: String,
				default: ''
			},
			// picker中显示的参数
			params: {
				type: Object,
				default () {
					return {
						year: true,
						month: true,
						day: true,
						hour: false,
						minute: false,
						second: false,
						province: true,
						city: true,
						area: true,
						timestamp: true
					}
				}
			},
			// 模式选择，region-地区类型，time-时间类型，selector-单列模式，multiSelector-多列模式
			mode: {
				type: String,
				default: 'time'
			},
			// 当mode=selector或者mode=multiSelector时，提供的数组
			range: {
				type: Array,
				default () {
					return []
				}
			},
			// 当mode=selector或者mode=multiSelector时，提供的默认项下标
			defaultSelector: {
				type: Array,
				default () {
					return [0]
				}
			},
			// 当range是一个Array<Object>时，通过rangeKey来指定Object中key的值作为显示的内容
			rangeKey: {
				type: String,
				default: ''
			},
			// 时间模式 ，是否显示时间后的单位
			showTimeTag: {
				type: Boolean,
				default: true
			},
			// 开始年份
			startYear: {
				type: [String, Number],
				default: 1950
			},
			// 结束年份
			endYear: {
				type: [String, Number],
				default: 2050
			},
			// 默认显示的时间
			// 2021-09-01 || 2021-09-01 13:00:23 || 2021/09/01
			defaultTime: {
				type: String,
				default: ''
			},
			// 默认显示的地区
			// 可传类似["广东省", "广州市", "天河区"]
			defaultRegin: {
				type: Array,
				default () {
					return []
				}
			},
			// 默认显示的地区编码
			// 可传类似["11", "1101", "110101"]
			// 如果defaultRegin和areaCode同时存在，优先使用areaCode的值
			areaCode: {
				type: Array,
				default () {
					return []
				}
			},
			// 取消按钮的文字
			cancelText: {
				type: String,
				default: '取 消'
			},
			// 取消按钮的颜色
			cancelColor: {
				type: String,
				default: ''
			},
			// 确认按钮的文字
			confirmText: {
				type: String,
				default: '确 认'
			},
			// 确认按钮的演示
			confirmColor: {
				type: String,
				default: ''
			},
			safeAreaInsetBottom: {
				type: Boolean,
				default: false
			},
			// 是否允许通过点击遮罩关闭
			maskCloseable: {
				type: Boolean,
				default: true
			},
			zIndex: {
				type: Number,
				default: 0
			}
		},
		computed: {
			// 监听参数变化
			propsChange() {
				return [this.mode, this.defaultTime, this.startYear, this.endYear, this.defaultRegin, this.areaCode]
			},
			// 监听地区发生变化
			regionChange() {
				return [this.province, this.city]
			},
			// 监听年月发生变化
			yearAndMonth() {
				return [this.year, this.month]
			},
			elZIndex() {
				return this.zIndex ? this.zIndex : this.$tn.zIndex.popup
			}
		},
		data() {
			return {
				years: [],
				months: [],
				days: [],
				hours: [],
				minutes: [],
				seconds: [],
				year: 0,
				month: 0,
				day: 0,
				hour: 0,
				minute: 0,
				second: 0,
				reset: false,
				startDate: '',
				endDate: '',
				valueArr: [],
				provinces: provinces,
				citys: citys[0],
				areas: areas[0][0],
				province: 0,
				city: 0,
				area: 0,
				// 列是否还在滑动中，微信小程序如果在滑动中就点确定，结果可能不准确
				moving: false
			}
		},
		watch: {
			propsChange() {
				this.reset = true
				setTimeout(() => this.init(), 10)
			},
			regionChange() {
				// 如果地区发生变化，为了让picker联动起来，必须重置this.citys和this.areas
				this.citys = citys[this.province]
				this.areas = areas[this.province][this.city]
			},
			yearAndMonth() {
				// 月份的变化，实时变更日的天数，因为不同月份，天数不一样
				// 一个月可能有30，31天，甚至闰年2月的29天，平年2月28天
				if (this.params.year) this.setDays()
			},
			value(val) {
				// 微信和QQ小程序由于一些奇怪的原因(故同时对所有平台均初始化一遍)，需要重新初始化才能显示正确的值
				if (val) {
					this.reset = true
					setTimeout(() => this.init(), 10)
				}
			}
		},
		mounted() {
			this.init()
		},
		methods: {
			// 记录开始滑动
			pickStart() {
				// #ifdef MP-WEIXIN
				this.moving = true
				// #endif
			},
			// 记录滚动结束
			pickEnd() {
				// #ifdef MP-WEIXIN
				this.moving = false
				// #endif
			},
			// 根据传递的列表的数据获取显示的数据
			getItemValue(item, mode) {
				// 单列模式或者多列模式中的getItemValue同时被执行，故在这里再加一层判断
				if (this.mode === mode) {
					return typeof item === 'object' ? item[this.rangeKey] : item
				}
			},
			// 往数字前面补0
			formatNumber(num) {
				return this.$tn.number.formatNumberAddZero(num)
			},
			// 生成递进的数组
			generateArray(start, end) {
				// 转为数值格式，否则用户给end-year等传递字符串值时，下面的end+1会导致字符串拼接，而不是相加
				start = Number(start)
				end = Number(end)
				end = end > start ? end : start
				// 生成数组并获取其中索引然后提取出来(获取开始和结束之间的数据)
				return [...Array(end + 1).keys()].slice(start)
			},
			getIndex(arr, val) {
				let index = arr.indexOf(val)
				// 如果index为-1着找不到元素
				// ~(-1)=(-1)-1=0
				return ~index ? index : 0
			},
			// 日期时间处理
			initTimeValue() {
				// 格式化时间，在IE浏览器(uni不存在此情况)，无法识别日期间的"-"间隔符号
				let fdate = this.defaultTime.replace(/\-/g, '/')
				fdate = fdate && fdate.indexOf('/') == -1 ? `2021/01/01 ${fdate}` : fdate
				let time = null
				if (fdate) time = new Date(fdate)
				else time = new Date()
				// 获取年月日时分秒
				this.year = time.getFullYear()
				this.month = time.getMonth() + 1
				this.day = time.getDate()
				this.hour = time.getHours()
				this.minute = time.getMinutes()
				this.second = time.getSeconds()
			},
			// 初始化数据
			init() {
				this.valueArr = []
				this.reset = false
				if (this.mode === 'time') {
					this.initTimeValue()
					if (this.params.year) {
						this.valueArr.push(0)
						this.setYears()
					}
					if (this.params.month) {
						this.valueArr.push(0)
						this.setMonths()
					}
					if (this.params.day) {
						this.valueArr.push(0)
						this.setDays()
					}
					if (this.params.hour) {
						this.valueArr.push(0)
						this.setHours()
					}
					if (this.params.minute) {
						this.valueArr.push(0)
						this.setMinutes()
					}
					if (this.params.second) {
						this.valueArr.push(0)
						this.setSeconds()
					}
				} else if (this.mode === 'region') {
					if (this.params.province) {
						this.valueArr.push(0)
						this.setProvinces()
					}
					if (this.params.city) {
						this.valueArr.push(0)
						this.setCitys()
					}
					if (this.params.area) {
						this.valueArr.push(0)
						this.setAreas()
					}
				} else if (this.mode === 'selector') {
					this.valueArr = this.defaultSelector
				} else if (this.mode === 'multiSelector') {
					this.valueArr = this.defaultSelector
					this.multiSelectorValue = this.defaultSelector
				}
				this.$forceUpdate()
			},
			// 设置picker某一列的值
			setYears() {
				this.years = this.generateArray(this.startYear, this.endYear)
				// 设置this.valueArr某一项的值，是为了让picker预选中某一个值
				this.valueArr.splice(this.valueArr.length - 1, 1, this.getIndex(this.years, this.year))
			},
			setMonths() {
				this.months = this.generateArray(1, 12)
				this.valueArr.splice(this.valueArr.length - 1, 1, this.getIndex(this.months, this.month))
			},
			setDays() {
				let totalDays = new Date(this.year, this.month, 0).getDate()
				this.days = this.generateArray(1, totalDays)
				let index = 0
				// 避免多次触发导致值数组计算错误
				if (this.params.year && this.params.month) index = 2
				else if (this.params.month) index = 1
				else if (this.params.year) index = 1
				else index = 0

				// 当月份变化时，会导致日期的天数也会变化，如果原来选的天数大于变化后的天数，则重置为变化后的最大值
				// 比如原来选中3月31日，调整为2月后，日期变为最大29，这时如果day值继续为31显然不合理，于是将其置为29(picker-column从1开始)
				if (this.day > this.days.length) this.day = this.days.length
				this.valueArr.splice(index, 1, this.getIndex(this.days, this.day))
			},
			setHours() {
				this.hours = this.generateArray(0, 23)
				this.valueArr.splice(this.valueArr.length - 1, 1, this.getIndex(this.hours, this.hour))
			},
			setMinutes() {
				this.minutes = this.generateArray(0, 59)
				this.valueArr.splice(this.valueArr.length - 1, 1, this.getIndex(this.minutes, this.minute))
			},
			setSeconds() {
				this.seconds = this.generateArray(0, 59)
				this.valueArr.splice(this.valueArr.length - 1, 1, this.getIndex(this.seconds, this.second))
			},
			setProvinces() {
				if (!this.params.province) return
				let tmp = ''
				let useCode = false
				// 如果同时配置了defaultRegion和areaCode，优先使用areaCode参数
				if (this.areaCode.length) {
					tmp = this.areaCode[0]
					useCode = true
				} else if (this.defaultRegin.length) {
					tmp = this.defaultRegin[0]
				} else {
					tmp = 0
				}
				// 遍历省份数组
				provinces.map((v, k) => {
					if (useCode ? v.value == tmp : v.label == tmp) {
						this.province = k
						return
					}
				})

				this.provinces = provinces
				this.valueArr.splice(0, 1, this.province)
			},
			setCitys() {
				if (!this.params.city) return
				let tmp = ''
				let useCode = false
				// 如果同时配置了defaultRegion和areaCode，优先使用areaCode参数
				if (this.areaCode.length) {
					tmp = this.areaCode[1]
					useCode = true
				} else if (this.defaultRegin.length) {
					tmp = this.defaultRegin[1]
				} else {
					tmp = 0
				}
				// 遍历省份数组
				citys[this.province].map((v, k) => {
					if (useCode ? v.value == tmp : v.label == tmp) {

						this.city = k
						return
					}
				})
				this.citys = citys[this.province]
				this.valueArr.splice(1, 1, this.city)
			},
			setAreas() {
				if (!this.params.area) return
				let tmp = ''
				let useCode = false
				// 如果同时配置了defaultRegion和areaCode，优先使用areaCode参数
				if (this.areaCode.length) {
					tmp = this.areaCode[2]
					useCode = true
				} else if (this.defaultRegin.length) {
					tmp = this.defaultRegin[2]
				} else {
					tmp = 0
				}
				// 遍历省份数组
				areas[this.province][this.city].map((v, k) => {
					if (useCode ? v.value == tmp : v.label == tmp) {
						this.area = k
						return
					}
				})
				this.areas = areas[this.province][this.city]


				this.valueArr.splice(2, 1, this.area)
			},
			close() {
				this.$emit('input', false)
			},
			// 监听用户修改了picker列选项
			change(event) {
				this.valueArr = event.detail.value
				let i = 0
				if (this.mode === 'time') {
					// 使用i++是因为不知道数组的长度
					if (this.params.year) this.year = this.years[this.valueArr[i++]]
					if (this.params.month) this.month = this.months[this.valueArr[i++]]
					if (this.params.day) this.day = this.days[this.valueArr[i++]]
					if (this.params.hour) this.hour = this.hours[this.valueArr[i++]]
					if (this.params.minute) this.minute = this.minutes[this.valueArr[i++]]
					if (this.params.second) this.second = this.seconds[this.valueArr[i++]]
				} else if (this.mode === 'region') {
					// 标记省市是否发生了变化
					let provinceChange = false,
						cityChange = false
					if (this.params.province) {
						let value = this.valueArr[i++]
						if (this.province != value) {
							// 如果省份发生了变化，则重置市区的索引为0
							this.city = 0
							this.area = 0
							provinceChange = true
						}
						this.province = value
					}
					if (this.params.city && !provinceChange) {
						let value = this.valueArr[i++]
						if (this.city != value) {
							// 如果市发生了变化，则重置区的索引为0
							this.area = 0
							cityChange = true
						}
						this.city = value
					}
					if (this.params.area && !provinceChange && !cityChange) this.area = this.valueArr[i++]

					// 如果有省市进行了改变，重新设置列表的值
					if (provinceChange || cityChange) {
						this.valueArr = [this.province, this.city, this.area]
					}
				} else if (this.mode === 'multiSelector') {
					let index = null
					// 对比前后两个数组，寻找变更的是哪一列，如果某一个元素不同，即可判定该列发生了变化
					this.defaultSelector.map((v, idx) => {
						if (v != event.detail.value[idx]) index = idx
					})
					// 为了让用户对多列变化时，动态设置其他列
					if (index != null) {
						this.$emit('columnchange', {
							column: index,
							index: event.detail.value[index]
						})
					}
				}
			},
			// 用户点击确定按钮
			getResult(event = null) {
				// #ifdef MP-WEIXIN
				if (this.moving) return
				// #endif
				let result = {}
				// 只返回用户需要的数据
				if (this.mode === 'time') {
					if (this.params.year) result.year = this.formatNumber(this.year || 0)
					if (this.params.month) result.month = this.formatNumber(this.month || 0)
					if (this.params.day) result.day = this.formatNumber(this.day || 0)
					if (this.params.hour) result.hour = this.formatNumber(this.hour || 0)
					if (this.params.minute) result.minute = this.formatNumber(this.minute || 0)
					if (this.params.second) result.second = this.formatNumber(this.second || 0)
					if (this.params.timestamp) result.timestamp = this.getTimestamp()
				} else if (this.mode === 'region') {
					if (this.params.province) result.province = provinces[this.province]
					if (this.params.city) result.city = citys[this.province][this.city]
					if (this.params.area) result.area = areas[this.province][this.city][this.area]
				} else if (this.mode === 'multiSelector') {
					result = this.valueArr
				} else if (this.mode === 'selector') {
					result = this.valueArr
				}

				if (event) this.$emit(event, result)
				this.close()
			},
			// 获取时间戳
			getTimestamp() {
				// yyyy-mm-dd为安卓写法，不支持iOS，需要使用"/"分隔，才能二者兼容
				let time = this.year + '/' + this.month + '/' + this.day + ' ' + this.hour + ':' + this.minute + ':' + this
					.second;
				return new Date(time).getTime() / 1000;
			}
		}
	}
</script>

<style lang="scss" scoped>
	.tn-picker {
		&__content {
			position: relative;

			&__header {
				position: relative;
				display: flex;
				flex-direction: row;
				width: 100%;
				height: 90rpx;
				margin-top: 10rpx;
				padding: 0 30rpx;
				align-items: center;
				justify-content: space-between;
				box-sizing: border-box;
				font-size: 30rpx;
				background-color: #FFFFFF;

				&__btn {
					padding: 16rpx;
					box-sizing: border-box;
					text-align: center;
					text-decoration: none;
				}

				&__title {
					color: $tn-font-color;
				}

				&--cancel {
					color: $tn-font-sub-color;
				}

				&--confirm {
					background-color: #07C160;
					color: #FFFFFF;
					padding: 10rpx 25rpx;
					border-radius: 10rpx;
				}
			}

			&__body {
				width: 100%;
				height: 500rpx;
				overflow: hidden;
				background-color: #FFFFFF;

				&__view {
					height: 100%;
					box-sizing: border-box;
				}

				&__item {
					display: flex;
					flex-direction: row;
					align-items: center;
					justify-content: center;
					font-size: 32rpx;
					color: $tn-font-color;
					padding: 0 8rpx;

					&--text {
						font-size: 24rpx;
						padding-left: 8rpx;
					}
				}
			}
		}
	}
</style>